贾斯特罗错觉是一种光学错觉，由美国心理学家约瑟夫·贾斯特罗发现于1892年。在此图中，两个图形是相同的，虽然下面的看起来要大一些。

The Jastrow illusion is an optical illusion described by the American psychologist Joseph Jastrow in 1892.

In the illustration below, the two figures are identical, although the lower one appears to be larger. The short edge of the upper figure is compared to the long side of the lower one.